Koloroj (Colours) is a collection of six short stories by Julio Baghy (1891-1967), a Hungarian actor and one of the leading authors of the Esperanto movement in Hungary. He started to work for the Esperanto movement during WWI, when he was a prisoner of war in Siberia for six years from 1911 on. After the war Baghy moved back to Hungary, and he organised Esperanto courses in Estonia, Latvia, the Netherlands and France.
Black and white wood-cut illustrations and a design for the covers and dustjacket were made by a Polish artist and illustrator Mirosław Tokarczyk (born 1934).
References: Geoffrey Sutton, Concise Encyclopedia of the Original Literature of Esperanto, 2008, pp. 92-102.